How to debug "pure virtual function call"

Provide the pure virtual function a body in the absolute base class and put an assert statement. Code below:
class Base //abstract base class
{
   Base();
   virtual ~Base();
   virtual BOOL PureVirtualCall(void) = 0;
};

class Derived : public Base
{
   Derived();
   ~Derived();
   BOOL PureVirtualCall(void)
   {
     cout << "I am in Derived class here";
   }
};

//in cpp file
BOOL Base::PureVirtualCall(void)
{
  //if this is called implies a pure virtual function has been called
   cout << "Unexpected pure virtual function called";
   assert(0);
   return TRUE;
}


P.S. You may have to put such statements at all pure virtual functions body to get to the call that is causing the problem

If its a 3rd party thing than it means its a bug in their code and u can do nothing about it.
If its yours, see the above comment as a possible solution or use try-catch to fetch the error...

Hi vbk_bgm,

This method does not work. The pointer does not in vtable although it has implementation.  I use the following codes to test:

#include <iostream>
using namespace std;

typedef void(*Fun)();

class Base {
public:
  Base() {
    cout << "In Base" << endl;
    cout << "Virtual Pointer = " 
         << (int*)this << endl;
    cout << "Address of Vtable = " 
         << (int*)*(int*)this << endl;
    cout << "Value at Vtable 1st entry = " 
         << (int*)*((int*)*(int*)this+0) << endl;
    cout << "Value at Vtable 2nd entry = " 
         << (int*)*((int*)*(int*)this+1) << endl;
   
    // try to execute first virtual function
    Fun pFun = (Fun)*((int*)*(int*)this+0);
    pFun();

    cout << endl;
  }
  virtual void f1() = 0;
  virtual void f2() = 0;
};

void Base::f1()
{
     cout << "Base::f1()" << endl;
}

void Base::f2()
{
     cout << "Base::f2()" << endl;
}


class Drive : public Base {
public:
  Drive() {
    cout << "In Drive" << endl;
    cout << "Virtual Pointer = " 
         << (int*)this << endl;
    cout << "Address of Vtable = " 
         << (int*)*(int*)this << endl;
    cout << "Value at Vtable 1st entry = " 
         << (int*)*((int*)*(int*)this+0) << endl;
    cout << "Value at Vtable 2nd entry = " 
         << (int*)*((int*)*(int*)this+1) << endl;
    cout << endl;
  }
  virtual void f1() { cout << "Drive::f1" << endl; }
  virtual void f2() { cout << "Drive::f2" << endl; }
};


int main() {
  Drive d;

  return 0;
}

By the way, I have found up the way to debug it.  When the run-time error message box appears, run WinDbg and attach to the process, and then select call stack.  The WinDbg will keep waiting until message box is closed.  The call stack will then show the stacks.

Regards

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========
Werner